Gustav schock



(No Model.)

2 Sheets-Sheet 1.

G. SGHOO'K. GRINDING MILL.

Patented Oct. 2-5, 1892.

(No Model.) v 2 SheetsSheet 2.

G. SOHOGK. GRINDING MILL.

No. 484,884. Patented 001:. 25, 1892.

gW/TNESSES' INVENTOH:

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UNITED STATES PATENT OFFICE.

GUSTAV SOHOOK, OF NEW YORK, N. Y.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 484,884, dated October 25, 1892.

Application filed May 2'7, 1892. Serial No. 434,581. (No model.)

To all whom it may concern.-

Be it known that I, GUSTAV SGHOOK, residing in the city of New York, county of New York, and State of New York, have invented certainnew and usefullmprovementsin Grinding-Mills, of which the following is a specification.

The object of my invention is to provide improved means for preventing explosions in grinding-mills during their operation, and es pecially in that class of mills employed for grinding malt, grain, or analogous substances.

The invention consists in the improved grinding-mill and the arrangement and combination of the various parts thereof, substantially as hereinafter described, and finally embodied in the claims.

Referring to the accompanying drawings, in which like letters indicate corresponding parts, Figure 1 is an end view of my improved grinding-machine. Fig. 2 is a front view of the same; and Fig. 3 is a central vertical section on line 3 3 of Fig. 2, showing the internal arrangement of the parts.

In the drawings, A indicates the end supports or framing of the machine. The supports are provided with upper cross-bars B B, and their upper ends are formed above the bars B with abutments O C, on the top of which are secured by bolts or in any desired manner cross-barsD D, parallel with the crossbars B B. Between the abutments O and bars B and D are bearings E E, in which revolve shafts carrying crushing-rolls F F. These rolls are covered by a hood G, while below them is a chamber H and below this a collecting-hopper I. The outlet of the hopper I may join a conveying-pipe at J The hood G is provided at its upper portion with a receiver K in the ordinary manner. One Wall of the chamber H is provided with a glass plate L for observing its contents.

On one side of the chamber H is arranged a self-closing door M over an appropriate opening, or more than one, to allow access to it for obtaining samples of the ground material, and also acts as relief-pressure valves. On the other side of this chamber H is a self-closing door N over an appropriate opening, or more than one, to serve as automatic valve for the relief of internal pressure in the chamber H.

Directly below the rolls F F and within the chamber H is secured to the frame a sloping plate I) with its lower edge curved upward, forming an interior receiving-chamber c, as

shown in Fig. 3.

a a are'brushes for cleaning the rolls.

The chamber 0 is arranged under the crushing-rolls and has an outwardly-opening valvedischarge door e. No explosion can occur in the chamber'c, as any internal pressure will force the air-door e open, and thereupon the air-valve doors M and N will also open and allow all air and gas to escape until undue pressure is removed and danger of explosion averted.

The door 6 is provided with a weight f or analogous spring for keeping it normally closed; but when there is a sufficient accumulation of the ground material on the plate I) and in the chamber 0 the pressure of the contents will open the door 6, as shown by dotted lines, Fig. 3, and allow the ground ma terial to pass directly into the receiving-hop- Having thus described my invention, what I claim is- 1. In a grinding-mill, the combination of the incased crushing-rolls and the chamber H below said rolls with a plate b, forming an interior receiving-chamber 0, having an outlet above its bottom, but below said rolls, and with a self-closing door or valve N in the outer wall of the chamber H, all arranged to allow the valve to open under pressure Within said chamber H and to close in the absence of such pressure, substantially as described, and for the purposes set forth.

2. In a grinding-mill, the combination, with the incased crushing-rolls, of a lower hopperchamber H, a plate I), forming an interior receiving-chamber 0 within said hopper-chamber H, and a self-closing door-valve e in said interior receiving-chamber 0, adapted to permit the ground material to pass into the receiving-hopper, substantially as described, and for the purposes set forth.

3. In a grinding-mill, the combination of a pair, of crushing-rolls and a casing inclosing same with a self-closing door in said casing, adapted to open outwardly under pressure from within, and with an interior receivingchamber 0, having outwardly-opening selfclosing doore, substantially as "herein shown; and described.

4. In a grinding-mill, an explosion-prevent- 5 ive chamber a, secured to the frame within the chamber H and provided with self-closing Valve-door e, in combination with -self c1osing valve-doors M and N in the outer chamber H, allsaid parts beingadapted ito operate and be operated substantially as described.

GUSTAV SCHOOK. Witnesses:

HARRY M. TURK, E. L.- SHERMAN. 

